As Michael Phelps left a news conference at the Olympic Aquatic Center on Saturday, a photographer rushed up and asked, "Can I get one more photo?"

There is, of course, no shortage of photos of the American swimming great. He has posed for them more times than most of us ever will. But this time, Phelps continued walking through a doorway, not stopping or turning back, cradling a silver trophy honoring him as the greatest Olympian of all time. And before the door shut behind him, after one of the last news conferences of his career, Phelps had a one-word answer.